21″ / 533 mm
Nominal diameter
31 Hz
Resonance
0.36
Q factor
95 dB
Sensitivity
± 17.5 mm
Linear excursion
4000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.7
dB
Frequency response
30 - 1800
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
31.0
Hz
Mechanical quality factor
QMS
5.20
Electrical quality factor
QES
0.38
Total quality factor
QTS
0.36
Large signal parameters
Maximum linear excursion
xmax
17.5
mm
Air volume displaced at xmax
VD
2909
cm³
Power handling
P
1800
W
Program power
Pmax
4000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
1.6
mH
VC Diameter
115
mm
Winding height
HVC
42.5
mm
Magnet
Force factor
Bl
32.0
N/A
Motor constant
Bl/√RE
13.9
N/√W
Air gap height
HAG
15
mm
Material
Neodymium
Diaphragm
Effective diameter
460
mm
Effective area
SD
1662
cm²
Moving mass
MMS
372
g
Moving mass (without air load)
MMD
324.5
g
Suspensions
Stiffness
KMS
14.09
N/mm
Compliance
CMS
71
µm/N
Equivalent volume to the compliance
VAS
270
L
Mechanical resistance
RMS
13.93
N·s/m
Dimensions
Nominal diameter
21
″
533
mm
Overall diameter
545
mm
Baffle cutout diameter
492
mm
Overall depth
320
mm
Flange thickness
18
mm
Mounting depth
302
mm
Volume occupied by the driver (estimated)
10.0
L
Net weight
12.5
kg
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QSpeakers
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MfbLabs
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fS
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SD
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30 - 3000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
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Pmax
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SD
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fS
30 Hz
SD
1662 cm²
30 - 1800 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
14
Pmax
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